My thoughts on this one-
The fuel economy penalty for a slow warm up is pretty severe. If you are making a 20 minute run, most of that will be spent with a colder-than-ideal motor, which really hurts economy.
Also the truck just runs like crap when it's cold, doesn't it.
Even though it is still above freezing, I am going to put the rad blanket on now. In my experience, it helps warm up, and is not a problem to leave on, unless I am towing something.
I think that I will get the block heater on a timer, and start using it shortly.
I think I can save 1$/day by speeding up warmup, and that is easily more than the .10$ of electricity.